40
C l i m a t e M a s t e r W a t e r- S o u r c e H e a t P u m p s
C L I M A T E M A S T E R W A T E R - S O U R C E H E A T P U M P S
Tr a n q u i l i t y
®
2 0 ( T S ) S e r i e s
R e v. : 0 6 / 1 7 / 1 5
Description of
Operation
Status LED
(green)
Test LED
(yellow)
Fault LED
(red)
Alarm Relay
Normal mode
On
-
Off
Open
Normal mode with UPS
On
-
Flashing Code 8
Cycle (closed 5 sec,
open 25 sec)
DXM is non-functional
Off
Off
Off
Open
Fault Retry
Slow Flash
-
Flashing fault code
Open
Lockout
Fast Flash
-
Flashing fault code
Closed
Test Mode
-
On
-
-
Night Setback
Flashing Code 2
-
-
-
ESD
Flashing Code 3
-
-
-
HP Fault
Slow Flash
-
Flashing Code 2
Open
LP Fault
Slow Flash
-
Flashing Code 3
Open
LT1 Fault
Slow Flash
-
Flashing Code 4
Open
LT2 Fault
Slow Flash
-
Flashing Code 5
Open
CO Fault
Slow Flash
-
Flashing Code 6
Open
Over/Under Voltages
Slow Flash
-
Flashing Code 7
Open (closed after 15
minutes)
Invalid T-stat Inputs
Flashing Code 4
-
-
-
DXM Control -
For detailed control information, see
DXM AOM (part #97B0003N13), Lon controller AOM (part
#97B0013N01) or MPC AOM (part # 97B0031N01).
-Slow Flash = 1 fl ash every 2 seconds
-Fast Flash = 2 fl ashes every 1 second
-Flash code 2 = 2 quick fl ashes, 10 second pause, 2 quick
fl ashes, 10 second pause, etc.
-On pulse 1/3 second; off pulse 1/3 second
Field Selectable Inputs -
Test mode: Test mode allows
the service technician to check the operation of the
control in a timely manner. By momentarily shorting the
test terminals, the DXM control enters a 20 minute test
mode period in which all time delays are sped up 15
times. Upon entering test mode, the status LED will fl ash
a code representing the last fault. For diagnostic ease at
the thermostat, the alarm relay will also cycle during test
mode. The alarm relay will cycle on and off similar to the
status LED to indicate a code representing the last fault,
at the thermostat. Test mode can be exited by shorting
the test terminals for 3 seconds.
Retry mode:
If the control is attempting a retry of a fault,
the status LED will slow fl ash (slow fl ash = one fl ash every
2 seconds) to indicate the control is in the process of
retrying.
Field Confi guration Options -
Note: In the following
fi eld confi guration options, jumper wires should be
clipped ONLY when power is removed from the DXM
control.
Water coil low temperature limit setting:
Jumper
3 (JW3-LT1 Low Temp) provides fi eld selection of
temperature limit setting for LT1 of 30°F or 10°F [-1°F or
-12°C] (refrigerant temperature).
DXM Controls
Table 5b: DXM LED And Alarm Relay Operations
Not Clipped = 30°F [-1°C]. Clipped = 10°F [-12°C].
Air coil low temperature limit setting: Jumper 2 (JW2-
LT2 Low Temp) provides fi eld selection of temperature
limit setting for LT2 of 30°F or 10°F [-1°F or -12°C]
(refrigerant temperature).
Note: This jumper
should only be clipped under extenuating
circumstances, as recommended by
ClimateMaster technical services.
Not Clipped = 30°F [-1°C]. Clipped = 10°F
[-12°C].
Alarm relay setting:
Jumper 4 (JW4-AL2 Dry)
provides fi eld selection of the alarm relay
terminal AL2 to be jumpered to 24VAC or to
be a dry contact (no connection).
Not Clipped = AL2 connected to R.
Clipped = AL2 dry contact (no connection).
Low pressure normally open:
Jumper 1
(JW1-LP norm open) provides fi eld selection
for low pressure input to be normally closed or
normally open.
Not Clipped = LP normally closed. Clipped = LP normally
open.
DIP Switches - Note: In the following fi eld
confi guration options, DIP switches should only be
changed when power is removed from the DXM
control.
DIP Package #1 (S1) -
DIP Package #1 has 8 switches
and provides the following setup selections:
1.1
- Unit Performance Sentinel (UPS) disable: DIP Switch
1.1 provides fi eld selection to disable the UPS feature.
On = Enabled. Off = Disabled.
1.2 -
Compressor relay staging operation: DIP 1.2
provides selection of compressor relay staging operation.
The compressor relay can be selected to turn on with
a stage 1 or stage 2 call from the thermostat. This
is used with dual stage units (2 compressors where
2 DXM controls are being used) or with master/
slave applications. In master/slave applications,
each compressor and fan will stage according to
its appropriate DIP 1.2 setting. If set to stage 2, the
compressor will have a 3 second on-delay before
energizing during a Stage 2 demand. Also, if set for stage
2, the alarm relay will NOT cycle during test mode.
On = Stage 1. Off = Stage 2.
1.3 -
Thermostat type (heat pump or heat/cool): DIP 1.3
provides selection of thermostat type. Heat pump or
heat/cool thermostats can be selected. When in heat/
cool mode, Y1 is the input call for cooling stage 1; Y2 is
the input call for cooling stage 2; W1 is the input call for
heating stage 1; and O/W2 is the input call for heating
stage 2. In heat pump mode, Y1 is the input call for
